It seems to me that rain is, to some people and even me, an emotional support. It calms certian people down and helps people when they're sad. Have you known somebody who would just go out in the rain? It could be because they just need to be alone and cry. The rain sprinkles on your face and washes away your tears. But sometimes they don't fade away and it stays inside instead of coming out. And even then it doesn't mean they don't still hurt inside.
